The old floor should be cut out. Preferably with a plasma cutter. The new floor should be welded in. It would probably be best to leave some overlap, flange it and then spot or rosette weld the new floor to the overlap flanges.
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www.autozone.com is a wealth of information with pictures, too.Click on the left side where it says Repair Info. Select 1993, Then Pontiac, Then Bonneville, then water pump. It helped us.
To replace a cigarette lighter in a 2008 Pontiac Vibe simply refer to the user manual.